Add and fix missing Triple tests, fix soundness checks

Cherry-pick of #6842.

Vendored Swift Driver triple was not checked against a few tests that weren't brought over from TSC after `TSC.Triple` type was deprecated. We should fix those tests, especially as they verified that per-component equality for triples worked instead of the current string-based equality check.

Also fixed `Utilities/soundness.sh` script failures.

(cherry picked from commit 2cdc604)

```
# Conflicts:
#	Tests/BasicsTests/FileSystem/PathShimTests.swift
#	Tests/BasicsTests/FileSystem/PathTests.swift
```

Author: MaxDesiatov

Sources/Basics/Triple+Basics.swift

@@ -193,7 +193,11 @@ extension Triple: CustomStringConvertible {
 }
 
 extension Triple: Equatable {
-    public static func == (lhs: Self, rhs: Self) -> Bool {
-        lhs.triple == rhs.triple
+    public static func ==(lhs: Triple, rhs: Triple) -> Bool {
+      lhs.arch == rhs.arch
+        && lhs.vendor == rhs.vendor
+        && lhs.os == rhs.os
+        && lhs.environment == rhs.environment
+        && lhs.osVersion == rhs.osVersion
     }
 }